ffmpeg-2.8.5

git-svn-id: svn://kolibrios.org@6147 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/ffmpeg/ffmpeg-2.8/libavformat/bit.c

@@ -0,0 +1,163 @@
+/*
+ * G.729 bit format muxer and demuxer
+ * Copyright (c) 2007-2008 Vladimir Voroshilov
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include "avformat.h"
+#include "internal.h"
+#include "libavcodec/get_bits.h"
+#include "libavcodec/put_bits.h"
+
+#define MAX_FRAME_SIZE 10
+
+#define SYNC_WORD  0x6b21
+#define BIT_0      0x7f
+#define BIT_1      0x81
+
+static int probe(AVProbeData *p)
+{
+    int i, j;
+
+    if(p->buf_size < 0x40)
+        return 0;
+
+    for(i=0; i+3<p->buf_size && i< 10*0x50; ){
+        if(AV_RL16(&p->buf[0]) != SYNC_WORD)
+            return 0;
+        j=AV_RL16(&p->buf[2]);
+        if(j!=0x40 && j!=0x50)
+            return 0;
+        i+=j;
+    }
+    return AVPROBE_SCORE_EXTENSION;
+}
+
+static int read_header(AVFormatContext *s)
+{
+    AVStream* st;
+
+    st=avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_id=AV_CODEC_ID_G729;
+    st->codec->sample_rate=8000;
+    st->codec->block_align = 16;
+    st->codec->channels=1;
+
+    avpriv_set_pts_info(st, 64, 1, 100);
+    return 0;
+}
+
+static int read_packet(AVFormatContext *s,
+                          AVPacket *pkt)
+{
+    AVIOContext *pb = s->pb;
+    PutBitContext pbo;
+    uint16_t buf[8 * MAX_FRAME_SIZE + 2];
+    int packet_size;
+    uint16_t* src=buf;
+    int i, j, ret;
+    int64_t pos= avio_tell(pb);
+
+    if(avio_feof(pb))
+        return AVERROR_EOF;
+
+    avio_rl16(pb); // sync word
+    packet_size = avio_rl16(pb) / 8;
+    if(packet_size > MAX_FRAME_SIZE)
+        return AVERROR_INVALIDDATA;
+
+    ret = avio_read(pb, (uint8_t*)buf, (8 * packet_size) * sizeof(uint16_t));
+    if(ret<0)
+        return ret;
+    if(ret != 8 * packet_size * sizeof(uint16_t))
+        return AVERROR(EIO);
+
+    if (av_new_packet(pkt, packet_size) < 0)
+        return AVERROR(ENOMEM);
+
+    init_put_bits(&pbo, pkt->data, packet_size);
+    for(j=0; j < packet_size; j++)
+        for(i=0; i<8;i++)
+            put_bits(&pbo,1, AV_RL16(src++) == BIT_1 ? 1 : 0);
+
+    flush_put_bits(&pbo);
+
+    pkt->duration=1;
+    pkt->pos = pos;
+    return 0;
+}
+
+AVInputFormat ff_bit_demuxer = {
+    .name        = "bit",
+    .long_name   = NULL_IF_CONFIG_SMALL("G.729 BIT file format"),
+    .read_probe  = probe,
+    .read_header = read_header,
+    .read_packet = read_packet,
+    .extensions  = "bit",
+};
+
+#if CONFIG_MUXERS
+static int write_header(AVFormatContext *s)
+{
+    AVCodecContext *enc = s->streams[0]->codec;
+
+    if ((enc->codec_id != AV_CODEC_ID_G729) || enc->channels != 1) {
+        av_log(s, AV_LOG_ERROR,
+               "only codec g729 with 1 channel is supported by this format\n");
+        return AVERROR(EINVAL);
+    }
+
+    enc->bits_per_coded_sample = 16;
+    enc->block_align = (enc->bits_per_coded_sample * enc->channels) >> 3;
+
+    return 0;
+}
+
+static int write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    AVIOContext *pb = s->pb;
+    GetBitContext gb;
+    int i;
+
+    if (pkt->size != 10)
+        return AVERROR(EINVAL);
+
+    avio_wl16(pb, SYNC_WORD);
+    avio_wl16(pb, 8 * 10);
+
+    init_get_bits(&gb, pkt->data, 8*10);
+    for(i=0; i< 8 * 10; i++)
+        avio_wl16(pb, get_bits1(&gb) ? BIT_1 : BIT_0);
+
+    return 0;
+}
+
+AVOutputFormat ff_bit_muxer = {
+    .name         = "bit",
+    .long_name    = NULL_IF_CONFIG_SMALL("G.729 BIT file format"),
+    .mime_type    = "audio/bit",
+    .extensions   = "bit",
+    .audio_codec  = AV_CODEC_ID_G729,
+    .video_codec  = AV_CODEC_ID_NONE,
+    .write_header = write_header,
+    .write_packet = write_packet,
+};
+#endif